Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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The invention relates to an articulated joint for
urban and suburban transport vehicles running on rails, in
particular for tramway and/or underground railway vehicles.
Known articulated vehicles used for urban and
5 suburban transport on rails differ from railway carriages in
terms of their use, by virtue of the short duration of
halts, the short time for which passengers remain on board,
and the fact that entry and exit generally take place
through different doors. This obliges passengers to enter
10 and exit rapidly, and requires them to transfer from the one
to the other door inside the vehicle while it is running.
These particular requirernents, which are satisfied more
comfortably and effectively the closer the vehicle floor is
to the rail level, especially in facilitating the use of the
15 public vehicle by elderly and/or handicapped persons, are in
contrast with the constraints imposed by the bogies. In -this
respect, these are of substantial height because of the
presence of the ~xle, the brakes, the motor, the suspensions
and -the shoc~ absorbers, and this generally means that the
~o coach floor, at least in positions corresponding with the
bogies, cannot be lower than a certain minimurn height (about
800 mm).
For this reason, a known solution to the aforesaid
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problem is to dispose the coach floor at a level which gives
comfortable access to passengers (for example 400-450 mm)
and to raise it at the bogies. The two different levels are
connected together by steps, which obviously constitu-te a
5 negative aspect of this solution in tha-t they hinder and
soMetirnes prevent free transfer of passengers through the
coach.
lt has also been proposed to construct bogies with
very small wheels (about 300 mm diameter against the 600 680
10 mm of normal wheels), but this solution has also proved
unsatisfactory both because it can obviously only be applied
to the supporting bogies (pivoted bogies) and not to the
motorised bogies due to the overall size of the motor
itself, and because of the need to remove the braking system
15 from such bogies, and finally because of the substantial
wear which results from the reduced wheel diameter.
The object of the invention is to obviate the
drawbacks of known articulated vehicles for urban and
suburban transport by rneans of an articulated joint which
20 enables the vehicle floor to occupy a single plane which
ex-tends continuously from one end of the other.
This object is attained according to the invention
by an articulated joint for urban and suburban transport
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vehicle running on rails, said vehicle having at least -two
adjacent bodies with depressed floors, said joint comprising
a turn cage, which:
is interposed between two adjacent bodies of said vehicle,
has a platform substantially coplanar with the depressed
floors oE said ad~acent bodies,
is provided with a bogie rotationally bound to said turn
cage, said bogie having wheels of independent type and a
horizontal dimension not greater -than that of said turn
cage, and said -turn cage,
possesses two lateral compartments, which extend upwards
beyond the platform and house the wheels of said bogie,
suspension, shock absorbers and braking members.
Essentially, the invention is based on the fact
that as the turn cage is rotatably rigid with the bogie,
even when traversing bends there is no change in the over-
all space taken up by the wheels and the suspension and
braking members. These can therefore be housed in the two
side zones of the turn cage, and although these can be of
greater height than the turn cage platform, they are
sufficiently narrow to provide a continuous passage between
the two adjacent bodies, which are constructed with a
depressed floor.
In order to make the turn cage platform and thus
the continuous floor of the vehicle even lower, the bogie
wheels can be of independent type, i.e. without an axle.
Again according to the inven-tion, the articulated
join-t can have the turn cage of a grea-ter longitudinal size
than -the diame-ter of conventional cylindrical -turn cages,
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and with transversal size not greater -than ~he transversal
encumbr~ance o~ the bodies, the di.stance between wheel
centres of the bogie being consequently greater.
The present invention is described in detail
5 hereinafter with reference to the accompanying drawings, in
which:
Figlire 1 is ~ partial vertical longitudinal secti.on -through
a portion o~` an urban or subllrban rail-running
vehicle provided with a depressed floor and an
articulated joint according to the invention;
Figure 2 is a vertical section on the line II-II of cigure
1 ;
Figure 3 is a horizontal section on the line III-III of
figure 1;
5 Figure 4 is an enlarged detailed plan view of the bogie
carrying the articulate joint;
Figure 5 is a side view on the line V-V figure ~;
Figure 6 is a vertical section on the line VI-VI of ~i.gure
4;
0 ~igure 7 is a front view on the line VII-VII of figure 4;
and
Figure 8 is a section on the l.ine VIII-VIII of ~igure 6.
As can be seen from the figures, the articulated
joint according to the invention which connects together two
bodies 1 of an urban or suburban transport vehicle, for
example a tramway vehicle, comprises a turn cage 2 mounted
on a bogie indicate overall by 3.
The bodies 1 are constructed with a depressed
floor, ie an inner floor which is about 400 mm above the
rail level. They are provided at their end with an appendix
4 pivoted to a -thrust block 5 provided in the bogie 3.
The turn cage 2 is of substantially cylindrical
10 confiyuration and has diameter slightly greater than the
diameter of conventional turn cages although having an
overall transverse dimension less than that of the bodies 1.
As stated, the turn cage 2 is mounted on a bogie 3
comprising four independent wheels 6 fitted to a structure 7
15 which also supports the brake shoes 8 operated by
conventional pneumatic cylinders 9. A swing beam 12, on
which the ghrust block 5 is mounted by means of bearings 13,
is also fitted to the structure 7 by means of primary
suspensions 10 and secondary suspensions 11.
Four horizontal shock absorbers 1~ and vertical
shock absorbers 15 of known type are also disposed between
the structure 7 of the bogie 3 and the swing beam 12.
The horizontal shock absorbers 1~, the vertical
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shock absorbers 15, the primary suspensions 10, the
secondary suspensions 11 and the operating cylinders 9 for
the braking system occupy an overall space which extends
upperly beyond the platform 16 of the turn cage 2, this
platform covering the thrus-t block 5 and the appendices 4 of
the bodies 1. Said members are housed in two lateral
compartments l7 of the turn cage 2, which pratically cause
no obstruction to the free transfer of passengers from one
body 1 to the adjacent body, and in fact being limited
upperly to a height comparable to that of the vehicle seats
they form two benches which can be used as seats themselves.
In order to enable the platform of the turn cage 2
to be situated in the lowest possible position relative to
the rail level, the platform being coplanar with the floor
of the bodies 1, the wheels 6 as stated are of independent
type, ie without an axle.
Furthemore, the diameter of the turn cage 2, which
as stated exceeds the diameter of conventional turn cages,
enables the distance between the wheel centres of the bogie
3 to be sufficien-t to prevent bogie hunting, which is
inevitably present if the distance between wheel centres is
srnall.
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